<div id="chart-tab" class="col s12">
  <div id="chart" class="col s12"></div>
  <div class="col s6" id="chart-menu">
    <div title="可视化开关" id="chart-switch-div" class="switch">
      <label>
        <input type="checkbox" id="chart-switch" />
        <span class="lever"></span>
      </label>
    </div>
    <div title="清除数据" id="chart-clean-div">
      <a class="waves-effect btn-floating btn-small red" id="chart-clean">
        <i class="material-icons">delete</i>
      </a>
    </div>
  </div>
</div>
